Correct! That's why I specified that
All-Star # 62 was the first appearance of the "new" Earth 2 Superman, and not just the Earth 2 Superman, who first appeared much earlier. As I mentioned in my first comment, prior to
All-Star # 62, Earth 2 Superman was functionally identical to Earth 1 Superman in powers, personality, etc. There's an issue where the two Supermen fight, and they are utterly indistinguishable without the aid of dialogue tags.
I actually think that makes a lot of sense.
After all, the bulk of the JSA is people who don't seem to exist on Earth 1, like Jay Garrick and Wes Dodds. If the characters are based on Golden Age comics, well... Superman
was around in the Golden Age. Why would we assume he'd be different on Earth 1 than Earth 2? Any character evolution or retcons applied to the former would surely be applied to the latter, right?
Unlike Flash or GL, there was never a hard break between one version of Superman and the next. On the contrary, Mort Weisinger was
allegedly pretty firm that there was a fairly concrete timeline, with Superboy stories set prior to 1938. Obviously it wasn't a perfect match-up. You might argue that Lois is a youthful 40 in the year 1960, but not that Jimmy is 40 in 1970! The timeline may simply have been a way to keep "the immortal Superman" a little more mortal. He's not consistently drawn to age, but given Weisinger's famous inferiority complex regarding Superman, it may have helped Mort sleep a little easier!
Anyway, that timeline being in place, it would mean that barring a few odd retcons and a general lack of aging, all the Golden Age stories were already in Earth 1 Superman's past (helps that you couldn't go back and read the old stuff to see the inconsistencies like you can today!), and presumably Earth 2 Superman was the exact same.
In fact the only real difference between them in the late 60s and early 70s crossovers was that sometimes (and as in the Golden Age, this wasn't even consistent within a single issue) Earth 2 Supes would have a slightly different chest emblem, which eventually evolved into what we recognize as the Earth 2 S.
By the late 70s, it had been a few years since Earth 2 Superman last showed up, and Weisinger was no longer a recent memory as he had been in the early 70s, and Earth 1 Superman had transitioned to a pretty universally accepted "sliding scale timeline". I don't know if was Conway or Levitz who had the idea of basically treating the earliest days of the character as a template for how to diffentiate Earth 2 Superman from the main one, but it was a good move that gave Earth 2 Superman a distinct identity for the first time. I
want to say it was the later Roy Thomas who came up with the idea of basically canonizing weird inconsistencies from before the series was set in stone as "differences" between Earth 1 and 2 Superman, like "Kal-L," Kryptonians having powers on Krypton, Luthor's red hair, no Superboy, George Taylor and the Daily Star, etc - all things that were changed to their normal state within the Golden Age years, mind you!n But I think it was Conway or Levitz who must have come up with the basic premise of Superman-2 & Power Girl being explicitly physically weaker than the Kal & Kara of Earth 1, as well as both of the, being, perhaps as a result, bigger roughnecks!
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So... yeah.
All-Star # 62.
Sorry that explanation ran a little long!